Blame bridge/monitor.c

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/*
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 * brmonitor.c		"bridge monitor"
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 *
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 *		This program is free software; you can redistribute it and/or
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 *		modify it under the terms of the GNU General Public License
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 *		as published by the Free Software Foundation; either version
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 *		2 of the License, or (at your option) any later version.
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 *
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 * Authors:	Stephen Hemminger <shemminger@vyatta.com>
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 *
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <time.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <linux/if_bridge.h>
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#include <linux/neighbour.h>
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#include <string.h>
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#include "utils.h"
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#include "br_common.h"
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static void usage(void) __attribute__((noreturn));
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static int prefix_banner;
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static void usage(void)
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{
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	fprintf(stderr, "Usage: bridge monitor [file | link | fdb | mdb | all]\n");
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	exit(-1);
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}
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static int accept_msg(struct rtnl_ctrl_data *ctrl,
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		      struct nlmsghdr *n, void *arg)
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{
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	FILE *fp = arg;
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	if (timestamp)
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		print_timestamp(fp);
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	switch (n->nlmsg_type) {
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	case RTM_NEWLINK:
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	case RTM_DELLINK:
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		if (prefix_banner)
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			fprintf(fp, "[LINK]");
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		return print_linkinfo(n, arg);
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	case RTM_NEWNEIGH:
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	case RTM_DELNEIGH:
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		if (prefix_banner)
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			fprintf(fp, "[NEIGH]");
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		return print_fdb(n, arg);
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	case RTM_NEWMDB:
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	case RTM_DELMDB:
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		if (prefix_banner)
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			fprintf(fp, "[MDB]");
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		return print_mdb_mon(n, arg);
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	case NLMSG_TSTAMP:
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		print_nlmsg_timestamp(fp, n);
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		return 0;
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	default:
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		return 0;
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	}
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}
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int do_monitor(int argc, char **argv)
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{
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	char *file = NULL;
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	unsigned int groups = ~RTMGRP_TC;
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	int llink = 0;
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	int lneigh = 0;
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	int lmdb = 0;
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	rtnl_close(&rth);
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	while (argc > 0) {
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		if (matches(*argv, "file") == 0) {
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			NEXT_ARG();
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			file = *argv;
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		} else if (matches(*argv, "link") == 0) {
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			llink = 1;
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			groups = 0;
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		} else if (matches(*argv, "fdb") == 0) {
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			lneigh = 1;
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			groups = 0;
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		} else if (matches(*argv, "mdb") == 0) {
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			lmdb = 1;
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			groups = 0;
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		} else if (strcmp(*argv, "all") == 0) {
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			groups = ~RTMGRP_TC;
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			prefix_banner = 1;
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		} else if (matches(*argv, "help") == 0) {
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			usage();
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		} else {
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			fprintf(stderr, "Argument \"%s\" is unknown, try \"bridge monitor help\".\n", *argv);
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			exit(-1);
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		}
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		argc--;	argv++;
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	}
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	if (llink)
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		groups |= nl_mgrp(RTNLGRP_LINK);
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	if (lneigh) {
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		groups |= nl_mgrp(RTNLGRP_NEIGH);
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	}
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	if (lmdb) {
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		groups |= nl_mgrp(RTNLGRP_MDB);
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	}
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	if (file) {
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		FILE *fp;
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		int err;
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		fp = fopen(file, "r");
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		if (fp == NULL) {
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			perror("Cannot fopen");
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			exit(-1);
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		}
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		err = rtnl_from_file(fp, accept_msg, stdout);
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		fclose(fp);
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		return err;
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	}
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	if (rtnl_open(&rth, groups) < 0)
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		exit(1);
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	ll_init_map(&rth);
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	if (rtnl_listen(&rth, accept_msg, stdout) < 0)
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		exit(2);
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	return 0;
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}